ASSESSING THE INFLUENCE OF UNCERTAIN PARAMETERS ON THE VIBRATION QUALITY OF CARS

Abstract

During the operation of a car, structural parameters such as vehicle body mass, damping coefficient of the shock absorber, tire stiffness, vehicle speed,
and other parameters are continuously changing. These parameters directly affect the car's vibrations. This study focuses on the uncertainty of three key
parameters: vehicle body mass, damping coefficient of the shock absorber, and suspension stiffness. A general model of car with 7 degrees of freedom is
developed to evaluate ride comfort and road safety. The impact of these uncertain structural parameters on the system's characteristics is assessed by
varying the values between 50 - 150% of the initial values in the time and frequency domains using Matlab' s "ureal" function. The simulation results in
both domains under different conditions showed that the uncertain parameters significantl y affect the car's ride comfort and road safety.